Flow patterns and mixing mechanisms in the screw mixing element of a co-rotating twin-screw extruder.(Abstract): An article from: Polymer Engineering and Science
Book Details
PublisherSociety of Plastics Engineers, Inc.
ISBN / ASINB0008EU4JU
ISBN-13978B0008EU4J4
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is an article from Polymer Engineering and Science, published by Society of Plastics Engineers, Inc. on May 1, 2002. The length of the article is 4024 words. The page length shown above is based on a typical 300-word page. The article is delivered in HTML format and is available in your Amazon.com Digital Locker immediately after purchase. You can view it with any web browser.
From the author: Non-Newtonian and non-isothermal flow simulations based on 3-D FEM were applied to a special and conventional elements of a twin-screw extruder. The screw mixing element (SME), a kind of special element, was a distributive mixing promoter consisting of a standard screw profile with slots cut across the flight tip to increase leakage flow. The full flight screw (FF) and the kneading block (KB) were examined as conventional elements in order to contrast the mixing behavior with the SME. The accuracy of numerical results was verified by experimentally measuring pressure and temperature. Additionally, marker particle tracking analysis was carried out to evaluate the distributive and dispersive mixing. Using the above analyses, the following results were obtained: The pumping capability of the SME was smaller than that of the FF and was the same as for the KB. The SME suppressed heat generation and showed the lowest temperature distribution of the three elements. For distributive mixing, the SME showed the best pe rformance judging from the mixing coefficient G, residence time distribution, and area stretch distribution based on a laminar mixing mechanism. A higher rotational speed achieved better distributive mixing performance. For dispersive mixing defined by stress distribution, the SME showed the second best performance next to the KB. It also showed better dispersive mixing performance with increasing rotational speed. The SME had the advantages of low heat generation and good distributive mixing.
Citation Details
Title: Flow patterns and mixing mechanisms in the screw mixing element of a co-rotating twin-screw extruder.(Abstract)
Author: Takeshi Ishikawa
Publication:Polymer Engineering and Science (Refereed)
Date: May 1, 2002
Publisher: Society of Plastics Engineers, Inc.
Volume: 42 Issue: 5 Page: 925(15)
Article Type: Abstract
Distributed by Thomson Gale
From the author: Non-Newtonian and non-isothermal flow simulations based on 3-D FEM were applied to a special and conventional elements of a twin-screw extruder. The screw mixing element (SME), a kind of special element, was a distributive mixing promoter consisting of a standard screw profile with slots cut across the flight tip to increase leakage flow. The full flight screw (FF) and the kneading block (KB) were examined as conventional elements in order to contrast the mixing behavior with the SME. The accuracy of numerical results was verified by experimentally measuring pressure and temperature. Additionally, marker particle tracking analysis was carried out to evaluate the distributive and dispersive mixing. Using the above analyses, the following results were obtained: The pumping capability of the SME was smaller than that of the FF and was the same as for the KB. The SME suppressed heat generation and showed the lowest temperature distribution of the three elements. For distributive mixing, the SME showed the best pe rformance judging from the mixing coefficient G, residence time distribution, and area stretch distribution based on a laminar mixing mechanism. A higher rotational speed achieved better distributive mixing performance. For dispersive mixing defined by stress distribution, the SME showed the second best performance next to the KB. It also showed better dispersive mixing performance with increasing rotational speed. The SME had the advantages of low heat generation and good distributive mixing.
Citation Details
Title: Flow patterns and mixing mechanisms in the screw mixing element of a co-rotating twin-screw extruder.(Abstract)
Author: Takeshi Ishikawa
Publication:Polymer Engineering and Science (Refereed)
Date: May 1, 2002
Publisher: Society of Plastics Engineers, Inc.
Volume: 42 Issue: 5 Page: 925(15)
Article Type: Abstract
Distributed by Thomson Gale
